NFL.com reported this week that the 49ers offered Boone a deal that would pay him among the top-12 of guards.

But a source said if that were the case, Boone would already be signed and under contract. That money in the 49ers' proposal would not kick in until the 2016 season, sources said.

Guard Joe Looney has been starting at right guard in Boone's absence. Boone does not plan to report to the 49ers without a new contract.

"We believe in Joe Looney," 49ers coach Jim Harbaugh said. "We believe we can win with Joe Looney. Again, Joe Looney is working every day to improve his game and that’s what the unit is doing, all 11 and key backups."